* {
    margin: 0;
    padding: 0;
}

body {
    font-size: 14px;
    color: #333;
}

.header {
    margin: 0 auto;
}

a {
    text-decoration: none;
}

.lf {
    float: left;
}

.rf {
    float: right;
}

.mr-10 {
    margin-right: 10px;
}

.ml-10 {
    margin-left: 10px;
}

.header {
    width: 1100px;
    height: 100px;
    float: none;
}

.logo {
    width: 210px;
}

.logo>img {
    width: 210px;
    height: 100px;
}

.daohang {
    height: 100px;
}

.daohang>a {
    padding-top: 43px;
}

.button1 {
    padding: 8px;
    margin-top: 35px;
    color: white;
    background-color: #3291f6;
    border-radius: 5px;
    border: none;
    cursor: pointer;
}

.button1:hover {
    background-color: #000;
}

.daohang a:visited {
    color: #333;
}

.daohang a:hover {
    color: #3291f6;
}

.cf::after {
    content: '';
    display: block;
    clear: both;
}